2156235479 has 4 divisors (see below), whose sum is σ = 2159508120. Its totient is φ = 2152962840.

The previous prime is 2156235461. The next prime is 2156235491. The reversal of 2156235479 is 9745326512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2156235479 - 2¹⁶ = 2156169943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156235449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635332 + ... + 1636649.

It is an arithmetic number, because the mean of its divisors is an integer number (539877030).

Almost surely, 2^2156235479 is an apocalyptic number.

2156235479 is a deficient number, since it is larger than the sum of its proper divisors (3272641).

2156235479 is an equidigital number, since it uses as much as digits as its factorization.

2156235479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272640.

The product of its digits is 453600, while the sum is 44.

The square root of 2156235479 is about 46435.2826953815. The cubic root of 2156235479 is about 1291.9094130096.

The spelling of 2156235479 in words is "two billion, one hundred fifty-six million, two hundred thirty-five thousand, four hundred seventy-nine".